package org.wx.thread.threadpool;

import io.netty.util.concurrent.DefaultThreadFactory;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @description: 线程池的状态位
 * @author: wangxun
 * @createDate: 2021/11/26
 * @version: 1.0
 */
@Slf4j
public class ThreadPoolState {
    private final AtomicInteger ctl = new AtomicInteger(ctlOf(RUNNING, 0));
    private static final int COUNT_BITS = Integer.SIZE - 3;
    private static final int CAPACITY   = (1 << COUNT_BITS) - 1;

    // runState is stored in the high-order bits
    private static final int RUNNING    = -1 << COUNT_BITS;
    private static final int SHUTDOWN   =  0 << COUNT_BITS;
    private static final int STOP       =  1 << COUNT_BITS;
    private static final int TIDYING    =  2 << COUNT_BITS;
    private static final int TERMINATED =  3 << COUNT_BITS;

    // Packing and unpacking ctl
    private static int runStateOf(int c)     { return c & ~CAPACITY; }
    private static int workerCountOf(int c)  { return c & CAPACITY; }
    private static int ctlOf(int rs, int wc) { return rs | wc; }

    public static void main(String[] args) {
        System.out.println(Integer.toBinaryString(CAPACITY));
        System.out.println(Integer.toBinaryString(~CAPACITY));
        System.out.println(Integer.toBinaryString(RUNNING));
        System.out.println(Integer.toBinaryString(SHUTDOWN));
        System.out.println(Integer.toBinaryString(STOP));
        System.out.println(Integer.toBinaryString(TIDYING));
        System.out.println(Integer.toBinaryString(TERMINATED));
    }
}
